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Revision 6d297540f75d759489054e8b07932208fc4db2cb authored by Rahul Lakkireddy on 11 June 2021, 06:47:47 UTC, committed by David S. Miller on 11 June 2021, 18:15:00 UTC 
cxgb4: halt chip before flashing PHY firmware image
 
When using firmware-assisted PHY firmware image write to flash,
halt the chip before beginning the flash write operation to allow
the running firmware to store the image persistently. Otherwise,
the running firmware will only store the PHY image in local on-chip
RAM, which will be lost after next reset.

Fixes: 4ee339e1e92a ("cxgb4: add support to flash PHY image")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent f046bd0
Raw File
atomic64.c 
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Generic implementation of 64-bit atomics using spinlocks,
 * useful on processors that don't have 64-bit atomic instructions.
 *
 * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 */
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/atomic.h>

/*
 * We use a hashed array of spinlocks to provide exclusive access
 * to each atomic64_t variable.  Since this is expected to used on
 * systems with small numbers of CPUs (<= 4 or so), we use a
 * relatively small array of 16 spinlocks to avoid wasting too much
 * memory on the spinlock array.
 */
#define NR_LOCKS	16

/*
 * Ensure each lock is in a separate cacheline.
 */
static union {
	raw_spinlock_t lock;
	char pad[L1_CACHE_BYTES];
} atomic64_lock[NR_LOCKS] __cacheline_aligned_in_smp = {
	[0 ... (NR_LOCKS - 1)] = {
		.lock =  __RAW_SPIN_LOCK_UNLOCKED(atomic64_lock.lock),
	},
};

static inline raw_spinlock_t *lock_addr(const atomic64_t *v)
{
	unsigned long addr = (unsigned long) v;

	addr >>= L1_CACHE_SHIFT;
	addr ^= (addr >> 8) ^ (addr >> 16);
	return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
}

s64 atomic64_read(const atomic64_t *v)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);
	s64 val;

	raw_spin_lock_irqsave(lock, flags);
	val = v->counter;
	raw_spin_unlock_irqrestore(lock, flags);
	return val;
}
EXPORT_SYMBOL(atomic64_read);

void atomic64_set(atomic64_t *v, s64 i)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);

	raw_spin_lock_irqsave(lock, flags);
	v->counter = i;
	raw_spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_set);

#define ATOMIC64_OP(op, c_op)						\
void atomic64_##op(s64 a, atomic64_t *v)				\
{									\
	unsigned long flags;						\
	raw_spinlock_t *lock = lock_addr(v);				\
									\
	raw_spin_lock_irqsave(lock, flags);				\
	v->counter c_op a;						\
	raw_spin_unlock_irqrestore(lock, flags);			\
}									\
EXPORT_SYMBOL(atomic64_##op);

#define ATOMIC64_OP_RETURN(op, c_op)					\
s64 atomic64_##op##_return(s64 a, atomic64_t *v)			\
{									\
	unsigned long flags;						\
	raw_spinlock_t *lock = lock_addr(v);				\
	s64 val;							\
									\
	raw_spin_lock_irqsave(lock, flags);				\
	val = (v->counter c_op a);					\
	raw_spin_unlock_irqrestore(lock, flags);			\
	return val;							\
}									\
EXPORT_SYMBOL(atomic64_##op##_return);

#define ATOMIC64_FETCH_OP(op, c_op)					\
s64 atomic64_fetch_##op(s64 a, atomic64_t *v)				\
{									\
	unsigned long flags;						\
	raw_spinlock_t *lock = lock_addr(v);				\
	s64 val;							\
									\
	raw_spin_lock_irqsave(lock, flags);				\
	val = v->counter;						\
	v->counter c_op a;						\
	raw_spin_unlock_irqrestore(lock, flags);			\
	return val;							\
}									\
EXPORT_SYMBOL(atomic64_fetch_##op);

#define ATOMIC64_OPS(op, c_op)						\
	ATOMIC64_OP(op, c_op)						\
	ATOMIC64_OP_RETURN(op, c_op)					\
	ATOMIC64_FETCH_OP(op, c_op)

ATOMIC64_OPS(add, +=)
ATOMIC64_OPS(sub, -=)

#undef ATOMIC64_OPS
#define ATOMIC64_OPS(op, c_op)						\
	ATOMIC64_OP(op, c_op)						\
	ATOMIC64_OP_RETURN(op, c_op)					\
	ATOMIC64_FETCH_OP(op, c_op)

ATOMIC64_OPS(and, &=)
ATOMIC64_OPS(or, |=)
ATOMIC64_OPS(xor, ^=)

#undef ATOMIC64_OPS
#undef ATOMIC64_FETCH_OP
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP

s64 atomic64_dec_if_positive(atomic64_t *v)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);
	s64 val;

	raw_spin_lock_irqsave(lock, flags);
	val = v->counter - 1;
	if (val >= 0)
		v->counter = val;
	raw_spin_unlock_irqrestore(lock, flags);
	return val;
}
EXPORT_SYMBOL(atomic64_dec_if_positive);

s64 atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);
	s64 val;

	raw_spin_lock_irqsave(lock, flags);
	val = v->counter;
	if (val == o)
		v->counter = n;
	raw_spin_unlock_irqrestore(lock, flags);
	return val;
}
EXPORT_SYMBOL(atomic64_cmpxchg);

s64 atomic64_xchg(atomic64_t *v, s64 new)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);
	s64 val;

	raw_spin_lock_irqsave(lock, flags);
	val = v->counter;
	v->counter = new;
	raw_spin_unlock_irqrestore(lock, flags);
	return val;
}
EXPORT_SYMBOL(atomic64_xchg);

s64 atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
{
	unsigned long flags;
	raw_spinlock_t *lock = lock_addr(v);
	s64 val;

	raw_spin_lock_irqsave(lock, flags);
	val = v->counter;
	if (val != u)
		v->counter += a;
	raw_spin_unlock_irqrestore(lock, flags);

	return val;
}
EXPORT_SYMBOL(atomic64_fetch_add_unless);
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